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This is a free, Japanese vertical shooter that follows closely all the standards of the genre. The player controls a small spaceship moving upwards and shooting down waves of flying enemies, maneuvering it to avoid collision with any incoming craft or their showering projectiles. The Z key is the main shooting button, with X being the bomb trigger whose explosion radius wipes out most of the enemies off the screen. As usual, there's a gigantic boss enemy at the end of each area that must be defeated to finish the stage and move to the next level. [source:mobygames]